Journal of Tropical Oceanography ›› 2018, Vol. 37 ›› Issue (3): 80-85.doi: 10.11978/2017075CSTR: 32234.14.2017075

Special Issue: 南海专题

• Orginal Article • Previous Articles     Next Articles

The characteristics of shallow gas reservoir developed in the northern continental slope of South China Sea

Guangjian ZHONG1,2(), Ruwei ZHANG1,2, Hai YI1,2, Changmao FENG1,2, Zhongquan ZHAO1,2   

  1. 1. Key Laboratory of Marine Mineral Resources, Ministry of Land and Resources, Guangzhou 510760, China
    2. Guangzhou Marine Geological Survey, Guangzhou 510760, China
  • Received:2017-07-01 Revised:2017-12-20 Online:2018-06-10 Published:2018-05-03
  • Supported by:
    China Geological Survey Project (DD20160154)

Abstract:

The shallow gas reservoir in the northern deep water area of the South China Sea (SCS) is a new type of oil-gas reservoir associated with gas hydrate, which has the characteristics of shallow burial and large scale, and its burial depth is generally less than 300 m. The shallow gas reservoir was formed by the gas hydrate cap in the deep cracking gas along the fault, and the identification of bottom simulating reflector is an effective method to find the shallow gas reservoir. The gas sources mainly include: pyrolysis gas, biogas and mixture. Slope tensile rupture is a major channel for gas migration, a sand layer at the bottom of the hydrate is the main reservoir of shallow gas accumulation, and the hydrate layer is blocked. Looking from gas hydrate distribution characteristics found in the SCS, shallow gas reservoir, widely distributed in slope deep-water area, with big reservoir thickness, and potentially significant resources, is a new type of reservoir while mining costs are relatively low.

Key words: shallow gas reservoir, gas hydrate, continental slope, bottom simulating reflector (BSR), South China Sea